How is ent-3-Methoxy-17-methylmorphinan-10-one (CAS: 57969-05-8) typically synthesized?

ent-3-Methoxy-17-methylmorphinan-10-one is typically synthesized through a multi-step process involving the protection of the morphinan ring, introduction of the methoxy group, and subsequent derivatization. Commonly used catalysts include Lewis acids, and the overall yield can range from 50% to 70%. Detailed synthetic methodology and conditions can be found in various organic chemistry literature.